Characterization of propionic acid bacteria using matrix-assisted laser desorption/ionization (MALDI) mass spectrometry |
| |
Authors: | L I Vorob’eva F M Khasaeva N V Vasilyuk E Trenquil |
| |
Institution: | 1.Moscow State University,Moscow,Russia;2.Carnegie-Mellon University,Pittsburgh,USA |
| |
Abstract: | It was shown that matrix-assisted laser desorption/ionization (MALDI) mass spectrometry could be used for the diagnostic characterization
of propionic acid bacteria (PABs). The spectra of proteins (whole PAB cells) with a molecular mass of 3000 to 11 000 were
obtained and analyzed using three matrices: sinapinic (SA), 2,5-dihydroxibenzoic (DHB), and α-cyano-4-hydroxycinnamic acid
(HCCA). The MALDI spectra of PAB revealed the protein peaks characteristic of (1) the genus Propionibacterium (3496, 5386, 5605, 10 470), (2) the groups of species sharing the common composition of their cell walls and fatty acids,
and (3) a species (four species were investigated). Exemplified by the P. shermanii strains (the collection and mutant ones) producing and not producing vitamin B12, the possibility of using MALDI profiles for strain differentiation was confirmed. The MALDI profiles of the propionic acid
cocci of the genus Luteococcus differ substantially from the profiles of PAB strains of the genus Propionibacterium, which is an additional proof of the validity of whole-cell MALDI spectra for generic differentiation of bacteria. Our investigation
shows that the bacterial groups determined using the MALDI profiles correlate with the phylogenetic 16S rRNA gene groups,
thus demonstrating the high resolution of this method for the differentiation of intraspecific differences (subspecies, strains). |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|